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39 lines
813 B
Go
39 lines
813 B
Go
// Copyright (c) The OpenTofu Authors
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// SPDX-License-Identifier: MPL-2.0
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// Copyright (c) 2023 HashiCorp, Inc.
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// SPDX-License-Identifier: MPL-2.0
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package dag
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// Edge represents an edge in the graph, with a source and target vertex.
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type Edge interface {
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Source() Vertex
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Target() Vertex
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Hashable
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}
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// BasicEdge returns an Edge implementation that simply tracks the source
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// and target given as-is.
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func BasicEdge(source, target Vertex) Edge {
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return &basicEdge{S: source, T: target}
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}
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// basicEdge is a basic implementation of Edge that has the source and
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// target vertex.
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type basicEdge struct {
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S, T Vertex
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}
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func (e *basicEdge) Hashcode() interface{} {
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return [...]interface{}{e.S, e.T}
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}
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func (e *basicEdge) Source() Vertex {
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return e.S
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}
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func (e *basicEdge) Target() Vertex {
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return e.T
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}
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